* [PATCH v2 RESEND] xen/manage: correct return value check on xenbus_scanf()
@ 2017-02-03 8:54 Jan Beulich
2017-02-03 17:04 ` Boris Ostrovsky
0 siblings, 1 reply; 2+ messages in thread
From: Jan Beulich @ 2017-02-03 8:54 UTC (permalink / raw)
To: Boris Ostrovsky, Juergen Gross; +Cc: xen-devel, linux-kernel
A negative return value indicates an error; in fact the function at
present won't ever return zero.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
---
v2: For consistency with other code don't consider zero an error
(utilizing that xenbus_scanf() at present won't return zero).
Adjust commit message accordingly.
---
drivers/xen/manage.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- 4.10-rc6/drivers/xen/manage.c
+++ 4.10-rc6-xen-manage-xenbus_scanf/drivers/xen/manage.c
@@ -277,7 +277,7 @@ static void sysrq_handler(struct xenbus_
err = xenbus_transaction_start(&xbt);
if (err)
return;
- if (!xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key)) {
+ if (xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key) < 0) {
pr_err("Unable to read sysrq code in control/sysrq\n");
xenbus_transaction_end(xbt, 1);
return;
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2017-02-03 8:54 [PATCH v2 RESEND] xen/manage: correct return value check on xenbus_scanf() Jan Beulich
2017-02-03 17:04 ` Boris Ostrovsky
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